Superconducting passive transmission line (ptl) receiver system

A method for aligning a reciprocal quantum logic (RQL) input pulse from a passive transmission line (PTL) to a phase of a bias clock signal, the method comprising:

• providing a DC bias current to a primary of a transformer of an active bias circuit to provide an induced bias current on a secondary of the transformer based on the DC bias current, the induced bias current providing a bias for a pulse-generator Josephson junction;
• providing the bias clock signal to the active bias circuit to trigger the pulse-generator Josephson junction in response to an approximate positive zero-crossing of a first phase of the bias clock signal to generate a bias pulse having a bias amplitude pulse-width that is approximately one-half a period of the bias clock signal;
• providing the RQL input pulse to a receiver core, the receiver core comprising at least one input Josephson junction configured to trigger in response to the RQL input pulse and to generate an intermediate pulse in response to RQL input pulse and the bias pulse;
• and
• providing the bias clock signal to an alignment Josephson transmission line (JTL) to trigger at least one alignment Josephson junction to generate an output pulse in response to the intermediate pulse and a second phase of the bias clock signal subsequent to the first phase to provide for reception of the input pulse across a wide timing window based on the bias pulse.

A reciprocal quantum logic (RQL) passive transmission line (PTL) receiver system comprising:

• a receiver core comprising an input resistor and at least one input Josephson junction and configured to receive a reciprocal quantum logic (RQL) input pulse from a PTL through the input resistor;
• an active bias circuit comprising:
• a pulse generator configured to generate a bias pulse based on a first phase of a bias clock signal, the bias pulse having a bias amplitude pulse-width that is approximately one-half a period of the bias clock signal;
• and
• a biasing buffer configured to amplify the bias pulse and to propagate the bias pulse to the receiver core, the at least one input Josephson junction of the receiver core being configured to trigger to generate an intermediate pulse in response to the RQL input pulse and the bias pulse;
• and
• an alignment Josephson transmission line (JTL) comprising at least one alignment Josephson junction, the at least one alignment Josephson junction of the alignment JTL being configured to trigger to generate an output pulse in response to the intermediate pulse and a second phase of the bias clock signal that is subsequent to the first phase to provide for reception of the input pulse across a wide timing window based on the bias pulse.